Black ice forms when the ground temperature is 32 degrees or lower. Rain, sleet or melted snow freezes instantly when it hits the ground. And the tricky part is, it's hard to see.

Black ice is just like "regular" ice, with no air bubbles. Without the air bubbles, the ice ends up being totally clear and takes the color of the background on which it's lying.

As temperatures drop below freezing again Wednesday night, ice is going to be an issue at night and on Thursday morning. Try salting your driveway and walkway, shuffling your feet when walking, and using handrails when they’re available.

MAY FEEL LIKE SPRING TONIGHT AND DEFINITELY FEELS LIKE WINTER. WE'VE GOT REPORTS OF DOZENS OF ACCIDENTS, INCLUDING ONE INVOLVING A SCHOOL BUS BUT DON'T BLAME THE SNOW FOR IT. "ACTION NEWS" METEOROLOGIST AS ASHLEY DOUGHERTY WITH THE INVISIBLE DODGERS ON OUR ROAD. Reporter: TEMPS WARMING UP. CURRENT TEMPERATURE 40 DEGREES BUT THE GROUND REPORTING IS AT 20 DEGREES SO EVEN THOUGH TEMPERATURES ARE ABOVE THE FREEZING MARK, STILL WITH THE GROUND TEMPERATURE BELOW FREEZING, IT COULD CAUSE FOR AN ICY MESS. OH, MY GOSH, I ALMOST LIKE SPUN OFF THE ROAD THIS MORNING. IT WAS SO AWFUL. Reporter: A ROUGH COMMUTE AND CARS SPINNING OUT ON WHAT LOOKED TO BE JUST A WET ROADWAY AND SLIDING INTO THE SNOW. EVEN A BUS IN DERRY TOWNSHIP FLIPPING ON ITS SIDE. ON THE ROADS ALL THE MELTING AND FREEZING IS CAUSING BLACK ICE. ACTUALLY SLIPPED THIS MORNING COMING OUT OF THE GARAGE. Reporter: RAIN, SLEET OR MELTED SNOW HITS THE FROZEN GROUND IT FREEZES INSTANTLY. THE TRICKY PART IS IT'S HARD TO SEE. BLACK ICE IS JUST LIKE REGULAR ICE WITHOUT THE AIR BUBBLES. WITH NO AIR BUBBLES THE ICE ENDS UP TOTALLY CLEAR AND TAKES THE COLOR OF THE BACKGROUND IT'S LYING ON. WITH TEMPERATURES DROPPING BELOW THE FREEZING MARK ICE IS GOING TO BE ANOTHER ISSUE FOR COMMUTERS TONIGHT AND TOMORROW MORNING. SO WITH ICE BEING AN ISSUE AGAIN, THERE ARE A FEW THINGS YOU CAN DO TO TRY TO STAY SAFE. WHEN WALKING SHUFFLE YOUR FEET IF THERE'S AN ICY SPOT. ALSO, IF SALT IS AVAILABLE, SALT YOUR WALKWAYS AND YOUR DRIVEWAYS, AND ANOTHER THING IF A HAND RAIL IS AVAILABLE WHILE YOU'RE OUTSIDE MAKE SURE YOU GRAB ON.